The Parma Plus has a huge metal heatsink that sticks out the top of the controller. This allows you to push the use of the controller through a slightly wider variable margin of motor and magnet set ups without it getting hot.
Alternatively, you could see it as a pointless addition if your controller ohm rating is fine for your racing and cars.
Alternatively, you could see it as a pointless addition if your controller ohm rating is fine for your racing and cars.